Creamy Butternut Squash Soup

1 butternut squash, peeled, seeded, and cubed into 1/2 in. pieces
2 carrots, diced
1 onion, diced
3 cans chicken broth
1/2 tsp salt
2 T butter

Put squash, carrots, onion, broth, and salt in saucepan. Simmer for about 40 minutes uncovered, or until squash is very tender. Pour everything into a blender, including butter, and puree until smooth. Serve with fresh cracked pepper. Yummy!